Explosion-proof decompression plate

Abstract

An explosion-proof decompression plate is provided outside the explosion-proof window of an architecture or equipment. A convex part that protrudes out of the window is formed in the center of the decompression plate, and a flange is formed around the convex part. Further, a confined space is formed inside the decompression plate that is opposite to the convex part. Several thru holes are formed on the flange, and a lock-joint portion of which the area is smaller than the thru hole is formed. Several joint ribs easily splitting are formed between the flange and the lock-joint portions to connect. Accordingly, when the air blast occurs in the architecture or equipment, the decompression plate is thrust away by the blast pressure caused by the air blast and an open mouth is formed to vent out the blast pressure.

What is claimed is: 
     
       1. An explosion-proof decompression plate mounted onto a frame, comprising:
 a convex part that protrudes outwards being formed in the center of the decompression plate; 
 a flange being formed around the convex part; 
 a confined space being formed inside the decompression plate that is opposite to the convex part; 
 at least one through hole being formed on the flange; 
 at least one lock-joint plate having a smaller area than the area of the at least one through hole; 
 at least one joint rib being formed between the flange and the at least one lock-joint plate; 
 the at least one joint rib having two ends, each of the two ends of the at least one joint rib being separately conjoint to the flange and the at least one lock-joint plate; 
 a first lock hole being formed passing through each of the least one lock-joint plate; and 
 at least one position limiting unit connecting the decompression plate to the frame, 
 wherein the frame comprises 
 a base plate; 
 an open mouth having a smaller area than the decompression plate being formed passing through the center of the base plate; 
 a second lock hole opposite to the first lock hole on the decompression plate being formed around the circumference of the open mouth; 
 the circumference of the base plate transversally stretching along the central axis of the open mouth to form a containing space wherein the decompression plate is contained; and 
 the base plate being formed with at least one third lock hole around the open mouth to mount the frame to the outside of an explosion-proof window of an architecture or equipment, and 
 the at least one position limiting unit comprising 
 a screw bolt passing through the decompression plate and the frame and having a length larger than the total thickness of the decompression plate and the frame; 
 a cap nut fixed to a back end of the screw bolt adjacent to the frame; 
 at least two gaskets respectively provided between a front end of the screw bolt and the outside of the decompression plate and between the frame and the cap nut; and 
 a clearance being formed between the cap nut and the frame. 
 
     
     
       2. The explosion-proof decompression plate mounted onto a frame according to  claim 1 , wherein a seal ring surrounding the open mouth of the base plate is provided between the decompression plate and the frame.